package com.study.stack;

import java.util.Stack;
public class LeetCode20 {

    public static boolean isValid(String s) {

        Stack<Character> stack = new Stack<>();
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (c == '(' || c == '[' || c == '{') {
                stack.push(c);
            } else {
                if (stack.isEmpty()) {
                    return false;
                }
                Character topChar = stack.pop();
                if (c == ')' && topChar != '(')
                    return false;
                if (c == ']' && topChar != '[')
                    return false;
                if (c == '}' && topChar != '{')
                    return false;
            }

        }
        return stack.isEmpty();
    }

    public static void main(String[] args) {
        String ss = "[]{{}{{}}[]";
        System.out.println(isValid(ss));
    }
}
